<script setup lang="ts">
import { IGoods } from '@/service/api/type/category.type';
import { IBanner } from '@/service/api/type/home.type'
import { onUnmounted, ref, watch } from 'vue'
const index = ref(0)

const props = withDefaults(
  defineProps<{
    sliders: IBanner[] | IGoods[][]
    duration?: number
    autoPlay?: boolean
  }>(),
  {
    sliders: () => [],
    duration: 3000,
    autoPlay: true
  }
)


let timer: number | null = null
const autoPlayFn = () => {
  timer = setInterval(() => {
    index.value++
    if (index.value >= props.sliders.length) {
      index.value = 0
    }
  }, props.duration)
}
autoPlayFn()

// watch(
//   () => props.sliders,
//   (newValue: IBanner[]) => {
//     if (newValue.length && props.autoPlay) {
//       index.value = 0
//       autoPlayFn()
//     }
//   },
//   {
//     immediate: true
//   }
// )

const stopPlay = () => {
  if (timer) clearInterval(timer)
}

const startPlay = () => {
  if (props.sliders.length && props.autoPlay) {
    autoPlayFn()
  }
}

const toggle = (step: number) => {
  const newIndex = index.value + step
  if (newIndex >= props.sliders.length) {
    index.value = 0
    return
  }

  if (newIndex < 0) {
    index.value = props.sliders.length - 1
    return
  }
  index.value = newIndex
}

onUnmounted(() => {
  if (timer) clearInterval(timer)
})
</script>

<script lang="ts">
export default {
  name: 'Carousel'
}
</script>

<template>
  <div class="carousel" @mouseenter="stopPlay" @mouseleave="startPlay">
    <ul class="carousel-body">
      <li
        class="carousel-item"
        v-for="(item, i) in (sliders as any)"
        :key="i"
        :class="{ fade: index === i }"
      >
        <RouterLink v-if="item.hrefUrl" :to="item.hrefUrl">
          <img :src="item.imgUrl" />
        </RouterLink>
        <div v-else class="slider">
          <RouterLink v-for="goods in item" :key="goods.id" :to="`/product/${goods.id}`">
            <img :src="goods.picture" />
            <p class="name ellipsis">{{ goods.name }}</p>
            <p class="price">&yen;{{ goods.price }}</p>
          </RouterLink>
        </div>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev" @click="toggle(-1)">
      <i class="iconfont icon-angle-left"></i>
    </a>
    <a href="javascript:;" class="carousel-btn next" @click="toggle(1)">
      <i class="iconfont icon-angle-right"></i>
    </a>
    <div class="carousel-indicator">
      <span v-for="(item, i) in sliders" :key="i" :class="{ active: index === i }"></span>
    </div>
  </div>
</template>

<style lang="less" scoped>
.carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  &-body {
    width: 100%;
    height: 100%;
    .slider {
      display: flex;
      justify-content: space-around;
      padding: 0 40px;
      > a {
        width: 240px;
        text-align: center;
        img {
          padding: 20px;
          width: 230px !important;
          height: 230px !important;
        }
        .name {
          font-size: 16px;
          color: #666;
          padding: 0 40px;
        }
        .price {
          font-size: 16px;
          color: @priceColor;
          margin-top: 15px;
        }
      }
    }
  }
  &-item {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    transition: opacity 0.5s linear;
    &.fade {
      opacity: 1;
      z-index: 1;
    }
    img {
      width: 100%;
      height: 100%;
    }
  }
  &-indicator {
    position: absolute;
    left: 0;
    bottom: 20px;
    z-index: 2;
    width: 100%;
    text-align: center;
    span {
      display: inline-block;
      width: 12px;
      height: 12px;
      background: rgba(0, 0, 0, 0.2);
      border-radius: 50%;
      cursor: pointer;
      ~ span {
        margin-left: 12px;
      }
      &.active {
        background: #fff;
      }
    }
  }
  &-btn {
    width: 44px;
    height: 44px;
    background: rgba(0, 0, 0, 0.2);
    color: #fff;
    border-radius: 50%;
    position: absolute;
    top: 228px;
    z-index: 2;
    text-align: center;
    line-height: 44px;
    opacity: 0;
    transition: all 0.5s;
    &.prev {
      left: 20px;
    }
    &.next {
      right: 20px;
    }
  }
}
&:hover {
  .carousel-btn {
    opacity: 1;
  }
}
</style>
